Kegel or PC muscle exercises shouldn't have any effect on the quantity of ejaculate but they can help increase the strength of contractions, thereby increasing the strength of the ejaculation.
I posted a link here some time back, let me have a quick look at where that was from.
Sorry, couldn't find it off hand. Maybe just search here for either PC Muscle, Kegel or Pubococcygeus Muscle. Hope that helps.
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